The XPIC technology doubles the spectrum usage by transmitting two signals by 2U3cbl0


									Green Microwave Backhaul Solutions

  With the development of the whole Telecom industry, especially impacted by the
  finical crises, the competition between operators has become more and more
  intense. Operators now pay great attention to the reduction of their costs. They
  believe that one who has taken the advantage of costs will be ahead of the game.

  For operators, the best way of decreasing their costs is to construct a Green
  Network, which adapts to the trend of the future Telecom network development.
  The Green Network aims at reducing the consumption of resources, cutting down
  the prices and minimizing the environmental pollution, and finally bringing benefits
  to people. Therefore, the Green Era is to come with the rising of the energy-saving
  concept in the Telecom industry.

  The green microwave solutions of ZTE can help operators reduce their CAPEX and
  OPEX effectively. The following chapters have the details of the green solutions.

  1.   MBC—Green Access Solution

  The most effective energy-saving way is to reduce the energy consumption of the
  edge nodes that are the greatest in number in a wireless network. The Microwave
  Base Station Convergence (MBC) solution is firstly developed by ZTE for this
  purpose. With the MBC solution, you can just insert the microwave boards into ZTE
  SDR BBU as an IDU to fulfill the transmission through microwaves.

  As no external IDUs are required in the MBC solution, large amount of space and
  network construction costs are saved. In addition, as the IDU is a just board
  requiring no external power supply or fans, each IDU can save at least 15 W power.
  For a network that has 100 edge nodes, at least 13,140 Kw.h power can be saved
  per year.

  The MBC solution provides a seamless connection between the microwave
  equipment and the BSTs with no external cables required. It helps operators greatly
  reduce faulty points and makes the maintenance work very convenient. As a result,
  the MBC solution is a real green solution for the future Telecom network.
2.   Green Nodal Solution

In traditional microwave solutions, each direction in the aggregation node needs an
IDU and the devices are connected by cables. In certain circumstances, additional
switches and MUXs are required; see the following figure on the left.

      Traditional Solution                          Nodal Solution


         IDU                 ADM/
                                                              Nodal IDU

In ZTE green nodal solution, only a 2U nodal IDU is required, which can fulfill all the
functions in the traditional solutions without additional switches or MUXs. The nodal
IDU is easy to install, which saves the costs in project installation. In addition, the
great fall in faulty points makes the maintenance more convenient and therefore
saves the operating and maintenance costs.

Compared with the traditional solutions, the nodal IDU solution features higher
integration, higher rate of multiplexing, and lower energy consumption. A
six-direction nodal IDU can save power by at least 35%.

3.   High Spectrum Usage Solution

The microwave spectrums are precious resource for operators. How to make the
best use the limited spectrums and therefore save the overall costs are nowadays
most concerned by operators. As a result, increasing the spectrum usage is the
most effective way for this purpose. Operators can increase the transmission
capacity over the same equipment and thus reduces the investments on new
network construction.

The ZTE Hybrid microwave solution supports the following technologies that help
increase the spectrum usage effectively:

Cross polarization interference canceller (XPIC)

     The XPIC technology doubles the spectrum usage by transmitting two signals
     horizontally and vertically over the same range of spectrum.

Adaptive coding and modulation (ACM)

     The ACM technology allows higher modulation scheme while remaining the
     same network availability. It supports modulation schemes from QPSK to 256
     QAM, which increases the spectrum usage four times than before.
Ethernet frame header compression.

     The frame header compression technology helps to compress the Ethernet
     frame headers, which can increase the spectrum usage by up to 45%.

The Hybrid microwave transmission is not limited by the SDH frame structure. By
using the preceding technologies, operators can provide 1 Gbps service bandwidth
over 56 MHz-spectrum bandwidth; otherwise, they can provide at most 100 MB
bandwidth under the same conditions.

4.   Smooth Migration Solution

The mobile Telecom industry is changing with each passing day. Operators have to
answer the following questions in this fast developing era:

How to cope with the fast changes in the mobile Backhaul requirements?

How to cope with the transition from voice services to data services during the
   migration from 2G network to 3G or 4G network?

How to switch the current network to the PTN network at an appropriate time?

To help operators answer the preceding questions, ZTE microwave puts forward a
smooth migration solution that can help operators migrate from 2G to 2G&3G and
even to 4G network without upgrading the hardware. The one-time investment
brings long term benefits. This solution therefore helps to save great investment on
the construction of future networks.
ZTE microwave also provides the solution to the evolution from Hybrid transmission
network to all-IP network. When the PTN time window comes, operators can
upgrade their network to the PTN network by just replacing the corresponding
boards of the TDM services and upgrading a small range of hardware. Therefore,
ZTE microwave solutions ensure the lowest investment on the network upgrading in
the future.

5.   Green Clock Solution

The mobile network requires a high-quality clock, because clock is the key factor
that determines the network quality. Most operators use external GPS or TDM
signals to transmit clock signals. The former costs too much and the latter does not
support the Ethernet clock transmission. Thus how to transmit effective clock
signals with low costs is a new challenge for operators.

ZTE microwave provides many solutions, such as 1PPS+TOD, BITS clock,
synchronous Ethernet and IEEE1500V2. With these solutions, high quality clock
signals can be transmitted for both 2G and 3G services. Each station requires one
less GPS as a result, which greatly reduces the construction and operating costs for

6.   Summary

ZTE microwave is committed to providing complete and point-to-point green
microwave solutions with high efficiency and low power consumption. The solutions
help operators reduce their costs from all aspects. ZTE microwave will cooperate
closely with operators to build a green and highly-efficient backhaul network and
help them win a leading position in today’s fierce competitions.

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